Filter photometer



FIG. 1 is a front perspective view of a filter photometer showing our new design;

FIG. 2 is a front plan view;

FIG. 3 is a rear plan view;

FIG. 4 is a side view of FIG. 1; and

FIG. 5 is a top plan view of the design shown in FIG. 1. 

The ornamental design for a filter photometer, as shown. 